EP0980102A1 - Verbesserungen an Vibrationswellenmotoren - Google Patents

Verbesserungen an Vibrationswellenmotoren Download PDF

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Publication number
EP0980102A1
EP0980102A1 EP99402039A EP99402039A EP0980102A1 EP 0980102 A1 EP0980102 A1 EP 0980102A1 EP 99402039 A EP99402039 A EP 99402039A EP 99402039 A EP99402039 A EP 99402039A EP 0980102 A1 EP0980102 A1 EP 0980102A1
Authority
EP
European Patent Office
Prior art keywords
normal
motor according
rotor
active
tangential
Prior art date
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Granted
Application number
EP99402039A
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English (en)
French (fr)
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EP0980102B1 (de
Inventor
Jean Thierry Audren
Daniel Bezanere
François Munier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sagem SA
Original Assignee
SFIM Industries SA
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Publication date
Application filed by SFIM Industries SA filed Critical SFIM Industries SA
Publication of EP0980102A1 publication Critical patent/EP0980102A1/de
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors

Definitions

  • the present invention relates to vibration motors.
  • Vibration motors are also known as ultrasonic motors to refer to their preferred frequency or piezoactive motors to refer to their preferred excitation material.
  • a particularly advantageous application of these motors relates to secondary flight controls for aircraft.
  • An object of the invention is to propose improvements for vibration motors and in particular to optimize the performance of these engines.
  • Vibration motors conventionally combine modes of tangential vibrations, which correspond to deformations according to directions parallel to the contact surface between the rotor and the stator, and normal vibration modes, which correspond to deformations according to directions normal to the contact surface between the rotor and the stator.
  • the tangential vibration modes are those on which is taken from the vibrational mechanical energy to be transformed into continuous movement (torque and angular speed) thanks to the mechanism not linear friction. These modes are therefore optimized to ensure mainly efficient energy transfer.
  • the invention proposes for its part to also operate the normal oscillators at their resonant frequency, i.e. size the motor so that the normal and tangential modes have very similar, even confused, resonance frequencies.
  • the invention proposes a vibration motor comprising a stator and a rotor, as well as excitation means for deforming said stator according to vibratory modes combining tangential vibrations and normal vibrations intended to cause the rotor to rotate, characterized in that the rotor and the excitation means are dimensioned so that the normal and tangential modes have frequencies of neighboring resonance, even confused, and correspond substantially to the excitation frequency.
  • Another object of the invention is to propose a vibration motor structure which overcomes this drawback and automatically correct a drift in the difference between the two frequencies, as well as possibly all or part, of the fixed deviations.
  • the structure of the vibration motor proposed by the invention advantageously includes means for correcting in operation the resonance frequency of normal mode and / or mode tangential.
  • the means that control these active elements may include means for modifying the Young's modulus of said active elements.
  • Yet another object of the invention is to simplify the device for mechanical prestressing of the piezoelectric material exciting the mode normal, in the case of an engine comprising at least one carcass two pairs of stator plates which include active elements of tangential deformation, as well as two rotor discs that extend between the plates of one and the other of the two pairs, active elements piezoelectric for the generation of a normal force extending between the trays of either of the two pairs which are opposite, means forming a spring being interposed between said pairs of plates and the carcass.
  • the active elements for the generation of normal effort are excited so that the masses of share and other of the same rotor disc are in phase opposition and the masses on either side of the active element are also in opposition to phase.
  • the active elements can then be dimensioned so as to check the prestressing conditions.
  • the vibration motor illustrated in FIGS. 1 and 2 comprises two rotor discs 1a, 1b and two pairs 4, 5 of stator plates cooperating respectively with said discs 1a, 1b.
  • the two rotor discs 1a, 1b are flexible discs, integral with the same shaft 3 by which they are rotatably mounted relative to a carcass 2.
  • the disc la extends between the two stator plates - referenced by 4a, 4b - of pair 4; disk 1b extends between the two stator plates - referenced by 5a, 5b - of pair 5.
  • the two plates 4a, 5a are the two stator plates of the two pairs 4, 5 which are facing each other and are subsequently called plates interiors, the two plates 4b, 5b being called plates exteriors.
  • Each stator plate 4a, 4b, 5a, 5b consists of a plurality of contact sectors 6 (called stator petals) which are distributed annularly and which are separated two by two by active elements of tangential strain 7.
  • petals or contact sectors 6 are metallic. They present advantageously, as has been proposed by the applicant in his French patent application filed under number 95-14169, at minus one area of a shape memory alloy near their contact surface.
  • the contact sectors 6 of the two interior plates 4a, 5a are to each other's right. Active elements 8 for generating a normal force are interposed between sectors 6 of these two plates interiors 4a, 5.
  • Means 9 forming a spring are interposed between the carcass 2 and the contact sectors 6 of the outer plates 4b, 5b.
  • the means 9 are of low stiffness, but with an elongation sufficient to maintain pressure in the contact sectors 6 on rotor discs, when compressed by the elongation of active elements 7 and 8.
  • the active elements 7 and / or the active elements 8 have advantageously multi-layer structures integrating in parallel or in series of piezoelectric ceramic layers and layers metallic and also incorporating control electrodes. Such a the multi-layer structure has the advantage of allowing the use of low voltages.
  • Two active elements 7 on either side of the same sector 6 are excited in phase opposition.
  • two active elements 8 neighbors are also excited in phase opposition.
  • the active elements 8 for generating a normal effort are controlled with the same excitation frequency as the active elements 7 of tangential deformation.
  • the vibration motor which has just been described is sized so that the normal resonant frequency and the tangential resonant frequencies are substantially both equal to this excitation frequency.
  • the piezoelectric material of an active element 8 sees between its electrodes the impedance of the electric generator that controls its excitation, i.e. zero impedance (short circuit) if the generator is a voltage generator and an infinite impedance (open circuit) if the generator is a current generator.
  • the means for adjusting the natural frequency of the oscillator may include a electrical installation with switch controlled so that the element active 8 is alternately supplied by a voltage generator and by a current generator, this command being carried out by a signal to width-modulated pulses whose frequency and duty cycle are adjusted according to the resonant frequency that one seeks to achieve.
  • the assembly which controls the active element 8 is a voltage source S in series with a variable impedance C or is a equivalent circuit.
  • This variable impedance C is preferably of capacitive type, so as not to introduce energy loss which would constitute additional depreciation in the oscillator.
  • An active element 8 made of piezoelectric material is electrically equivalent to a capacitor.
  • means are provided for switching I allowing the variable impedance to be short-circuited, so as to obtain the lowest possible stiffness.
  • the piezoelectric material of a active element 8 is separated into two controlled parts 8a and 8b independently.
  • One of these parts is ordered only by a fixed impedance generator S, which is for example a voltage generator.
  • the part 8b is mounted at the terminals not of variable capacity but of an Ic switch controllable.
  • part 8b can be used as a piezoelectric material deformation sensor.
  • This part 8b can also serve as a deformation sensor when connected to a variable setting capacity. Obviously the electrical gradient of the measurement is in this case a function of the capacity.
  • ⁇ U M 2 (2 ⁇ F ) 2 x not
  • the prestressing springs must produce a higher static force Uo or equal to ⁇ U.
  • this force is significantly higher than ⁇ U because it causes a drop in the efficiency of the engine. It is therefore desirable that Uo is practically equal to ⁇ U.
  • the solution proposed in the invention takes advantage of, as illustrated on the Figure 5, the flexibility of the rotor-stator interface.
  • Patent application 9514169 explains the advantage of this flexibility to improve the conversion efficiency of vibrations into movement continuous using a metal pawn field. There is a latitude of choice of the normal stiffness k of this interface structure.
  • the metal petals 6 on either side of the disc 1a are excited in phase with each other and in phase opposition to the petals on either side of the other disc of the rotor, that is to say of the disc 1b (respectively 1a).

Landscapes

  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
EP99402039A 1998-08-13 1999-08-11 Verbesserungen an Vibrationswellenmotoren Expired - Lifetime EP0980102B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9810391A FR2782420B1 (fr) 1998-08-13 1998-08-13 Perfectionnements aux moteurs a vibrations
FR9810391 1998-08-13

Publications (2)

Publication Number Publication Date
EP0980102A1 true EP0980102A1 (de) 2000-02-16
EP0980102B1 EP0980102B1 (de) 2003-09-24

Family

ID=9529664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99402039A Expired - Lifetime EP0980102B1 (de) 1998-08-13 1999-08-11 Verbesserungen an Vibrationswellenmotoren

Country Status (7)

Country Link
US (1) US6204590B1 (de)
EP (1) EP0980102B1 (de)
JP (1) JP2000060165A (de)
CA (1) CA2280415C (de)
DE (1) DE69911526T2 (de)
ES (1) ES2207146T3 (de)
FR (1) FR2782420B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2806225A1 (fr) * 2000-03-10 2001-09-14 Sagem Moteurs a vibrations
WO2002098735A1 (fr) 2001-06-07 2002-12-12 Sagem Sa Actionneur de commande de vol primaire a moteur a vibration

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001136761A (ja) * 1999-11-02 2001-05-18 Minolta Co Ltd アクチュエータ
DE10018226A1 (de) * 2000-04-12 2001-10-25 Bosch Gmbh Robert Sensorunabhängige Schwingungsamplitudenregelung
FR2819649B1 (fr) * 2001-01-17 2003-03-07 Sagem Moteur piezo-electrique
US6567759B2 (en) * 2001-03-29 2003-05-20 Siemens Energy & Automation, Inc. Motorized machine electrical system arc detection apparatus and methods
FR2824967A1 (fr) 2001-05-16 2002-11-22 Sagem Actionneur lineaire, notamment actionneur pour frein d'avion
FR2844933B1 (fr) * 2002-09-20 2004-11-26 Sagem Perfectionnements aux moteurs hautes puissances.
US20090212657A1 (en) * 2005-02-07 2009-08-27 National University Corporation Saitama University Equivalent-capacitance type actuator drive device
FR2886487B1 (fr) * 2005-05-31 2007-07-13 Sagem Defense Securite Perfectionnements aux rotors de moteurs hautes puissances
US20100313375A1 (en) * 2009-06-15 2010-12-16 3M Innovative Properties Company Grout cleaning tool
US11682535B2 (en) 2021-03-12 2023-06-20 Essex Industries, Inc. Rocker switch
EP4309200A1 (de) 2021-03-15 2024-01-24 Essex Industries, Inc. Fünfstellungsschalter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0907213A1 (de) * 1997-09-03 1999-04-07 Sfim Industries Verbesserungen an Vibrationswellenmotoren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59181585A (ja) * 1983-03-31 1984-10-16 Toshiba Corp 変位発生装置
JPH02214478A (ja) * 1989-02-15 1990-08-27 Aisin Seiki Co Ltd 超音波モータ
US5783898A (en) * 1996-02-26 1998-07-21 Mcdonnell Douglas Corporation Piezoelectric shunts for simultaneous vibration reduction and damping of multiple vibration modes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0907213A1 (de) * 1997-09-03 1999-04-07 Sfim Industries Verbesserungen an Vibrationswellenmotoren

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2806225A1 (fr) * 2000-03-10 2001-09-14 Sagem Moteurs a vibrations
EP1134883A3 (de) * 2000-03-10 2001-09-26 Sagem Sa Vibrationsmotoren
WO2002098735A1 (fr) 2001-06-07 2002-12-12 Sagem Sa Actionneur de commande de vol primaire a moteur a vibration
FR2825680A1 (fr) 2001-06-07 2002-12-13 Sagem Actionneur de commande de vol primaire a moteur a vibration
US7165746B2 (en) 2001-06-07 2007-01-23 Sagem Sa Vibration motor primary flight control actuator

Also Published As

Publication number Publication date
JP2000060165A (ja) 2000-02-25
EP0980102B1 (de) 2003-09-24
CA2280415A1 (fr) 2000-02-13
DE69911526D1 (de) 2003-10-30
CA2280415C (fr) 2012-01-03
US6204590B1 (en) 2001-03-20
ES2207146T3 (es) 2004-05-16
FR2782420B1 (fr) 2003-01-17
FR2782420A1 (fr) 2000-02-18
DE69911526T2 (de) 2004-07-01

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